could glaciate
Regular verb: glaciate - glaciated- glaciated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could glaciate
you could glaciate
he could glaciate
we could glaciate
you could glaciate
they could glaciate 	I could be glaciating
you could be glaciating
he could be glaciating
we could be glaciating
you could be glaciating
they could be glaciating	I could have glaciated
you could have glaciated
he could have glaciated
we could have glaciated
you could have glaciated
they could have glaciated	I could have been glaciating
you could have been glaciating
he could have been glaciating
we could have been glaciating
you could have been glaciating
they could have been glaciating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't glaciate
you couldn't glaciate
he couldn't glaciate
we couldn't glaciate
you couldn't glaciate
they couldn't glaciate 	I couldn't be glaciating
you couldn't be glaciating
he couldn't be glaciating
we couldn't be glaciating
you couldn't be glaciating
they couldn't be glaciating	I couldn't have glaciated
you couldn't have glaciated
he couldn't have glaciated
we couldn't have glaciated
you couldn't have glaciated
they couldn't have glaciated	I couldn't have been glaciating
you couldn't have been glaciating
he couldn't have been glaciating
we couldn't have been glaciating
you couldn't have been glaciating
they couldn't have been glaciating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I glaciate?
could you glaciate?
could he glaciate?
could we glaciate?
could you glaciate?
could they glaciate? 	could I be glaciating?
could you be glaciating?
could he be glaciating?
could we be glaciating?
could you be glaciating?
could they be glaciating? 	could I have glaciated?
could you have glaciated?
could he have glaciated?
could we have glaciated?
could you have glaciated?
could they have glaciated? 	could I have been glaciating?
could you have been glaciating?
could he have been glaciating?
could we have been glaciating?
could you have been glaciating?
could they have been glaciating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I glaciate?
couldn't you glaciate?
couldn't he glaciate?
couldn't we glaciate?
couldn't you glaciate?
couldn't they glaciate? 	couldn't I be glaciating?
couldn't you be glaciating?
couldn't he be glaciating?
couldn't we be glaciating?
couldn't you be glaciating?
couldn't they be glaciating? 	couldn't I have glaciated?
couldn't you have glaciated?
couldn't he have glaciated?
couldn't we have glaciated?
couldn't you have glaciated?
couldn't they have glaciated? 	couldn't I have been glaciating?
couldn't you have been glaciating?
couldn't he have been glaciating?
couldn't we have been glaciating?
couldn't you have been glaciating?
couldn't they have been glaciating?